[Libav-user] AV_CODEC_ID_SMPTE_KLV not recognized

wm4 nfxjfg at googlemail.com
Wed Aug 13 18:07:59 CEST 2014

On Wed, 13 Aug 2014 15:53:33 +0000
"Sears, Zachary" <zachary.sears at lmco.com> wrote:

> Hello,
> I am trying to create an application that can add a KLV data stream into an MPEG-TS stream.  I started with the muxing.C example and have everything working as far as creating a valid MPEG-TS video, but when I try and include the KLV stream the encoder can't be found.  In particular it is failing when I try AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_SMPTE_KLV), it returns with a failure to open the encoder.  When I add the video stream the codec id is AV_CODEC_ID_MPEG2VIDEO which it finds perfectly fine and everything works just fine.  I am using ffmpeg 2.1.4.
> I also have a known good sample video that has KLV metadata in it and when I try to use ffprobe on that video it finds both streams but returns with "Unsupported codec with id 1263294017 for input stream 1" where input stream 1 is the KLV stream.  Could it just be that I missed a flag at compile time, or simply need a newer version of FFMPEG?
> Thanks for any help

I have no idea what KLV is, but looking at the source, it seems KLV is
supported for demuxing and muxing (in libavformat), but there are no
encoders or decoders. I assume this means you have to
interpret/generate KLV data yourself.

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